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Maxam-Gilbert Sequencing

Maxam-Gilbert Sequencing

In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
Challenges of the Maxam-Gilbert Method
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Quantitative Detection of DNA-Protein Crosslinks and Their Post-Translational Modifications

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Physicochemical analysis of structural changes in DNA modified with glucose.

Jalaluddin M Ashraf¹, Binish Arif, Kiran Dixit

¹Department of Biochemistry, Faculty of Medicine, A.M.U., Aligarh 202002, UP, India.

International Journal of Biological Macromolecules

|July 4, 2012

Summary

This study characterizes glucose-induced changes in DNA, revealing the formation of DNA Amadori products and advanced glycation end products (AGEs). These findings highlight new molecular damage pathways in DNA due to sugar reactions.

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Area of Science:

Biochemistry
Molecular Biology
Chemical Biology

Background:

Advanced glycation end products (AGEs) form from reactions between reducing sugars and free amino groups.
While AGEs in proteins and nucleosides are studied, DNA AGEs remain less explored.
Understanding DNA glycation is crucial for cellular health and disease research.

Purpose of the Study:

To characterize the biophysical and chemical changes in DNA induced by glucose.
To investigate the formation and nature of DNA Amadori products and DNA AGEs.
To identify specific DNA AGEs resulting from glucose treatment.

Main Methods:

Incubation of DNA with glucose under controlled conditions.
Spectroscopic analysis (UV-Vis spectroscopy) to assess hyperchromicity.
Thermal denaturation studies to determine melting temperature (Tm) changes.
Fluorescence spectroscopy to monitor changes in DNA structure and interactions.

Main Results:

Glucose treatment induced time-dependent hyperchromicity in DNA.
A significant decrease in DNA melting temperature was observed, indicating structural destabilization.
Enhanced fluorescence emission intensity suggested conformational changes in DNA.
Formation of DNA Amadori products and DNA advanced glycation end products, primarily N²-carboxyethyl-2'-deoxyguanosine (CEdG), was confirmed.

Conclusions:

Glucose directly modifies DNA, leading to structural alterations and damage.
The formation of DNA Amadori products and CEdG represents a novel pathway of DNA glycation.
These findings provide a foundation for further research into the biological implications of DNA glycation.